/*
* \brief Spin lock used to synchronize different CPU cores
* \author Martin Stein
* \author Stefan Kalkowski
* \date 2012-11-30
*/
/*
* Copyright (C) 2012-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _SRC__LIB__HW__SPIN_LOCK_H_
#define _SRC__LIB__HW__SPIN_LOCK_H_
#include
#include
#include
namespace Hw { class Spin_lock; }
class Hw::Spin_lock
{
private:
enum State { UNLOCKED, LOCKED };
State volatile _locked = UNLOCKED;
public:
void lock()
{
while (!Genode::cmpxchg((volatile int*)&_locked, UNLOCKED, LOCKED))
;
}
void unlock()
{
Genode::memory_barrier();
_locked = UNLOCKED;
}
using Guard = Genode::Lock_guard;
};
#endif /* _SRC__LIB__HW__SPIN_LOCK_H_ */